[Exim] remote smtp syntax...

Can anyone tell me how I tell my exim server to forward all mail to my ISP's
SMTP server please? I'm finding that some MTA's will not accept mail from
me as my IP seems to be listed as dynamic (despite the fact that it never
actually changes) :o)

I'm guessing this is something to do with the remote_smtp: transport but I'm
struggling to find any examples of people doing it.

Thanks, Adam.